I found this on tumblr posted by a fan:

I gave this ring to Ricky at the fan sign event but why I see it on Changjo finger LOL by fronkey

WHAT DOES THIS MEAN? WAS IT JUST A GIFT OR.........................DID RICKY PURPOSE TO HIM??? OMG AJDFLJADSLJFLJDSLFJALSDFJ

EITHER WAY OMG THIS TOTALLY SHOWS THEY'RE TOGETHER! YOU DON'T GIVE A FREAKING RING TO SOMEONE THAT'S JUST YOUR FRIEND!!